DOT is a text format for representing abstract graphs, for example architecture.gv below:
“DOT” is not an abbreviation, just an all–caps name.
->to create a directed graph.
The last few lines of the DOT file were used to create an image suitable for inclusion in this book, and are completely optional.
bgcolor = transparent;sets the background to be transparent rather than a fixed color.
dpi = 300;sets the dots per inch to use to calculate the resulting image resolution.
size = "8.5,11!";creates an image scaled up to where either the width is 8.5", the height is 11", or both, at the given DPI.
-Tpngspecifies the output format as Portable Network Graphics, a popular bitmap image format. Other output formats are documented in
-Tsvgfor Scalable Vector Graphics output is probably the most popular vector image format.